Day Counter
Count total, business and weekend days between two dates, excluding holidays.
About Day Counter
The calculator counts calendar days as the simple difference between the two dates (optionally inclusive of the end date). Business days are counted by iterating through each day in the range and excluding Saturdays and Sundays. Any public holidays that fall on weekdays are then deducted from the business-day count to give 'working days'. Because public holidays vary by country and employer, the user must supply the count.
Formulas
Total days (inclusive)
Total days = (end timestamp − start timestamp) ÷ ms-per-day + 1
Working days
Working days = Business days − Holiday count
- B
- Business days (Mon–Fri)
- H
- Public holidays on weekdays
Worked example
With the default values below, Day Counter returns Total Calendar Days of 365. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Start Date
- 2025-01-01
- End Date
- 2025-12-31
- Include End Date
- Yes
- Public Holidays in Rangeaccepts 0–366
- 0
Results
- Total Calendar Days
- 365
- Business Days (Mon–Fri)
- 261
- Weekend Days
- 104
- Working Days (after holidays)Business days minus the entered holiday count.
- 261
- Total Weeks
- 52.1429
- Holidays Deducted
- 0
Step by step
- 1Date range= 2025-01-01 → 2025-12-31 (inclusive)
- 2Total calendar days= 365
- 3Business days (Mon–Fri)= 261
- 4Deduct public holidays= 261 working days
Assumptions and limits
- The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
What does 'Include End Date' do?
With it ON, both the start and end dates are counted. For example, Jan 1 to Jan 3 inclusive = 3 days. With it OFF, the end date is not counted: Jan 1 to Jan 3 = 2 days. Use OFF when you need the 'gap' between dates (e.g. days remaining until a deadline).
How do I account for public holidays?
Enter the number of public holidays that fall on weekdays within your date range. The calculator deducts them from the business-day count to give the 'Working Days' figure.
Does it handle leap years?
Yes. The calculator works at the millisecond level and lets JavaScript's Date object handle calendar irregularities including leap years.
How long does counting take for a very large range?
The business-day count iterates day by day. A 10-year range is ~3650 iterations — effectively instant.